Colds are not a form of detoxification. They are caused by a decrease in the body's immune capabilities and infections by common viruses such as influenza or parainfluenza, resulting in respiratory infections. Symptoms include a runny nose, cough, headache, fever, and sore throat. Influenza can also cause viral symptoms like sore limbs and swollen joints. During the acute phase, it is advisable to take antipyretic analgesics and use physical methods to reduce fever. These are not signs of the body detoxifying.